Door-check.



No. 714,255. Patented Nov. 25, |9012.`

C. F. SULLIVAN. Y.

000B CHECK.

I (Application filed Feb. 8. 1902.,

(N0 Model.)

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` UNITED 'STATES PATENT OFFICE.

CORNELIUS F. SULLlVAN, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THAYER DOOR CHECK AND SPRING CO.,

A CORPORATION OF MAINE.

DOOR-CHECK.

` SPECIFICATION forming part of Letters Patent N o. 714,255, dated November 25, 1902. Application filed February 8, 1902. Serial No. 93,173. (No model.)

To all whom it may concern:

I Beit known that I, CORNELIUS F. SULLI- VAN, a citizen of the United States, and a resident of Boston, in the county of Suffolk and l State of Massachusetts, have invented certain new and useful Improvements in Door- Checks, of which the following is a specication.`

This invention relates to a form of doorcheck which is especially intended to be used in connectionwith an ordinary screen-door Ahaving spring-hinges, and is adapted to pre veut the slamming of the door.

i For an understanding of my invention reference is made to the accompanying drawings, in which- Figure lis a front elevation showing my device applied to a doorhaving spring-hin ges. Fig. 2 is a bottom plan view thereof detached. Fig. 3 is a cross-section on line or of Fig. 4. Fig. 4 is a cross-section on line y y of Fig. 2.

Figs. 5, 6, and 7 are detail views.

e As indicated in Fig. 1, the door ct is hinged to the casing b by a spring-hinge c of common I form. A bracket l, having a circular recess in its under side,is secured to the casing directly above the door,as indicated in Fig. l. A circular disk 2 is concentrically arranged insaid recess and is journaled on a bolt 3, which has an enlarged `head and passes upe wardly through the center 'of the disk concentric with the inner walls of said recess. The diameter of disk 2 is such that it may rotate freely in said recess. An arma is firmly secured to disk 2, and a link 5 is pivoted to e the outer end of said arm and to a pivot 6, which projects upwardly from a bracket 7, the e latter being secured to the door at its top (see Fig. l) and the pivot 6, projecting slightly e thereabove, and extends through an aperture e in the outer end of link 5.- A segmentalshaped concave metal clip 8, having a leather y `face or shoe 9, is arranged in a recess which 1l `leads from the main recess of bracket l, in

"which the disk 2 is located, and a thumbscrew 10 passes through the wall of the bracket l and engages the opposite side of said clip from said shoe. The curve of the concave I y side of said shoe preferably corresponds to `5`o the curve of the edge of disk 2. A small plate Vsaid disk and clip l1 is secured to the under side of said bracket and holds said clip 8 and shoe 9 in place. The thumb-screw lO is tightened, so that a suitable amount of friction is placed on the edge of disk 2 as it is operated. I

The action of the above-described device .will be obvious. As the door is opened the disk will rotate on bolt 3. Thefriction on said disk is suitably adjusted so that it will not retard the opening of the door to a material degree. As the spring-hinges close the door thefriction of the packing or shoe on the disk retards its closing movement to a certain extent, but is not eifective to an appreciable extent until the door is nearly closed and the springs of the hinges lose a greater portion of their tension. The friction will then retard the speed of the closing movement so much that the door will shut softly and without the usual slam characteristic of doors which are closed simply by a spring. As the disk 2 is circular, the same device may be used both for a door which is hinged on the right side and a door which is hinged on the left side. VHaving described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is as follows:

The combination with a spring-actuated door, a check therefor comprising `a fixed bracket havinga circular casing open at one side and having a recess in its curved edge, a circular disk centrally journaledin said casing, an arm secured to said disk', a link pivoted to the outer end of said arm at one end and to the door at its other end, `a metal clip tted in said recess and provided with a friction-imparting face which engages the circular edge of said disk and a screw thread.- ed in the side of said casing and engages the opposite side of said clip from said face whereby the frictional engagement between may be adjusted, substantially as described.

In testimony whereof I have aflixed my signature in presence of two witnesses.

CORNELIUS F. SULLIVAN.

Witnessesi LOUIS H. HAERIMAN, G. E. UCKEE. 

